taxonID	type	description	language	source
03AA8798FFDCFFDC1C99FA00FB41FEAF.taxon	description	Index Fungorum number: IF 904361	en	Zhao, Yun-Wei, He, Shu-Cheng, Shi, Yuan-Ji, Wu, Ting, Zhang, Ying (2025): A new species of Clonostachys (Bionectriaceae) from Southwest China. Phytotaxa 722 (3): 235-246, DOI: 10.11646/phytotaxa.722.3.3, URL: https://doi.org/10.11646/phytotaxa.722.3.3
03AA8798FFDCFFDC1C99FA00FB41FEAF.taxon	etymology	Etymology: — The species epithet “ xishuangbannaensis ” refers to the place Xishuangbanna where the holotype was collected.	en	Zhao, Yun-Wei, He, Shu-Cheng, Shi, Yuan-Ji, Wu, Ting, Zhang, Ying (2025): A new species of Clonostachys (Bionectriaceae) from Southwest China. Phytotaxa 722 (3): 235-246, DOI: 10.11646/phytotaxa.722.3.3, URL: https://doi.org/10.11646/phytotaxa.722.3.3
03AA8798FFDCFFDC1C99FA00FB41FEAF.taxon	materials_examined	Holotype: — HKAS 133177	en	Zhao, Yun-Wei, He, Shu-Cheng, Shi, Yuan-Ji, Wu, Ting, Zhang, Ying (2025): A new species of Clonostachys (Bionectriaceae) from Southwest China. Phytotaxa 722 (3): 235-246, DOI: 10.11646/phytotaxa.722.3.3, URL: https://doi.org/10.11646/phytotaxa.722.3.3
03AA8798FFDCFFDC1C99FA00FB41FEAF.taxon	description	Asexual morph: Hyphomycetous. Colonies on WA, solitary, white at apex, raised, sparse. Conidiophores mononematous, penicillate, erect, straight or flexuous, unbranched when immature, branched when mature, smooth, thin-walled, septate, hyaline, terminal branches developing into phialides, 126 – 186 × 3.2 – 3.8 μm (x = 150 × 3.4 μm, n = 20). Phialides monophialidic, terminal, flask-shaped or cylindrical, aseptate, hyaline, smooth, thin-walled, guttulate, 13.7 – 17.9 × 2.2 – 3.2 μm (x = 16 × 2.8 μm, n = 20). Conidia aseptate, solitary, acrogenous, simple, ellipsoidal to oblong with obtuse ends, smooth, thin-walled, hyaline, 7.5 – 8.2 × 3.5 – 4.7 μm (x = 8.0 × 4.0 μm, n = 30). Sexual morph: Not observed. Culture characteristics: — Colonies on PDA reaching 2.5 – 3 cm after 15 days of incubation at 25 ° C, white to pale yellow, medium sparse, raised, smooth, lobate, velvety, ciliate, no pigment produced.	en	Zhao, Yun-Wei, He, Shu-Cheng, Shi, Yuan-Ji, Wu, Ting, Zhang, Ying (2025): A new species of Clonostachys (Bionectriaceae) from Southwest China. Phytotaxa 722 (3): 235-246, DOI: 10.11646/phytotaxa.722.3.3, URL: https://doi.org/10.11646/phytotaxa.722.3.3
03AA8798FFDCFFDC1C99FA00FB41FEAF.taxon	distribution	Distribution: — Xishuangbanna City, Yunnan Province, China.	en	Zhao, Yun-Wei, He, Shu-Cheng, Shi, Yuan-Ji, Wu, Ting, Zhang, Ying (2025): A new species of Clonostachys (Bionectriaceae) from Southwest China. Phytotaxa 722 (3): 235-246, DOI: 10.11646/phytotaxa.722.3.3, URL: https://doi.org/10.11646/phytotaxa.722.3.3
03AA8798FFDCFFDC1C99FA00FB41FEAF.taxon	materials_examined	Material examined: — CHINA. Yunnan Province: Xishuangbanna City, (21 ° 87 ’ N, 101 ° 32 ′ E, 640 m), on the lower part of leaves of Ageratina adenophora, 11 September 2022, collected by Shu-Cheng He, HSC 398 (holotype KUN-HKAS 133177; ex-type living culture KUNCC 24 - 18526).	en	Zhao, Yun-Wei, He, Shu-Cheng, Shi, Yuan-Ji, Wu, Ting, Zhang, Ying (2025): A new species of Clonostachys (Bionectriaceae) from Southwest China. Phytotaxa 722 (3): 235-246, DOI: 10.11646/phytotaxa.722.3.3, URL: https://doi.org/10.11646/phytotaxa.722.3.3
03AA8798FFDCFFDC1C99FA00FB41FEAF.taxon	discussion	Notes: — In the phylogenetic analysis, Clonostachys xishuangbannaensis clustered as sister to C. wenpingii (Luo & Zhuang 2014) (100 % MLBS / 1.00 BPP, Fig. 1). Morphologically, C. xishuangbannaensis shares similar characteristics with C. wenpingii in the shape of conidiophores (mononematous, penicillate, erect), flask-shaped or cylindrical, aseptate, hyaline phialides and conidia that are acrogenous, ellipsoidal or oblong with obtuse ends and hyaline (Luo & Zhuang 2014). However, C. xishuangbannaensis differs from C. wenpingii in having bigger conidia (8.0 × 4.0 μm vs 5.6 × 2.3 μm) and it also differed from C. wenpingii by 1.3 % ITS and by 0.3 % 28 S differences in the nucleotides. Both C. xishuangbannaensis and C. wenpingii were collected in Xishuangbanna, Yunnan Province, but C. xishuangbannaensis is endophytic on Ageratina adenophora while C. wenpingii is saprophytic on an unknown host (Luo & Zhuang 2014). Therefore, we propose the identification of our specimen as a new species, C. xishuangbannaensis.	en	Zhao, Yun-Wei, He, Shu-Cheng, Shi, Yuan-Ji, Wu, Ting, Zhang, Ying (2025): A new species of Clonostachys (Bionectriaceae) from Southwest China. Phytotaxa 722 (3): 235-246, DOI: 10.11646/phytotaxa.722.3.3, URL: https://doi.org/10.11646/phytotaxa.722.3.3
